Mechanical properties of annealed and martensitic Ti--6Al--4V. (A. ) microstructure of solution treated Ti--6Al--4V. (B. ) a study of fatigue damage with ultrasonic internal friction measurements. (C. ). Technical report

Technical Report · Sun Aug 01 00:00:00 EDT 1976

OSTI ID:7220175

Gilmore, C M; Imam, M A

Fatigue life studies are reported on annealed microstructures and on solution treated plus quenched microstructures, and it was found that specimens solution treated at about 900 C (1650 F) had the longest fatigue life, longer by at least a factor of four. The microstructure of solution treated and quenched Ti--6Al--4V is reported with particular emphasis on the solution temperature of 900 C (1650 F). It is proposed that it is the strain induced transformation of retained beta phase to martensite that is producing the improved fatigue life of this alloy. Internal friction measurements using a resonance technique at kilohertz (17650 Hz) frequency were made on Ti--6Al--4V that had been subject to cyclic fatigue loading. The measurements showed that the internal friction increased as the fatigue damage was increased.

• Research Organization: George Washington Univ., Washington, DC (USA). Inst. for the Study of Fatigue Fracture and Structural Reliability
• OSTI ID: 7220175
• Report Number(s): AD-A-038412
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ACOUSTIC TESTING
ALLOYS
ALUMINIUM ALLOYS
ANNEALING
CREEP
CRYSTAL STRUCTURE
DUCTILITY
ELASTICITY
FAILURES
FATIGUE
FREQUENCY RANGE
FRICTION
HEAT TREATMENTS
INTERNAL FRICTION
KHZ RANGE
KHZ RANGE 01-100
MATERIALS TESTING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NONDESTRUCTIVE TESTING
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUENCHING
TENSILE PROPERTIES
TESTING
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
ULTRASONIC TESTING
VANADIUM ALLOYS
VERY HIGH TEMPERATURE
YIELD STRENGTH